I tried to build a flyback converter (or what i think should be called a Flyback converter) using the KHB4D5N60F MOSFET but had a problem with current draw! So i decided to use a Power Transistor E13009 then it worked fine. I used the 74HC14 PWM circuit (previous post) to switch the transistor. The converter has a couple of flaws (the 12V input comes from a 90W power Supply), .. one of them is the heat dissipation!! Although it can deliver allot of power it heats up fast (BBJ vs MOSFET stuff ... mmmm )
Input: 12V, Output: ~60V without load. About 5.5 Amps with 24V DC Motor
Transistor: E13009, Diode: UF3003, Transformer from an old SMPS ,PWM with 74HC14
Important notice: Circuit is not efficient and it was built for experimental reasons only.